Hot-air furnace.



E. G. KENT, L. GILES & G. A. LYSTER.

HOT AIR FUBNAGE.

APPLIOATION nun x0v.12. 1912.

Patented Oct. 2l, 19.13.

CMI;

UNTTED STATES PATENT OFFICE.

EDWARD C. KENT, OF PASADENA, LLOYD GILES, OF VENICE, AND GEORGE A. LYSTER, OF LOS ANGELES, CALIFORNIA, ASSIGNOBS, BY MESNE ASSIGNMENTS, T O PACIFIC HEATING 8c MANUFACTURING C0., 0F LOS ANGELES, CALIFORNIA, A CORPORATION 0F CALIFORNIA.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented Oct. 21, 1913.

Application led November 12, 19,12. Serial No. 731,040.

To all whom t may concern Be it known that we, EDWARD C. KENT, a citizen of the United States, residing at Pasadena, Los Angeles county, California, LLorD GILEs, a citizen of the Unit-ed States, residing at Venice, Los Angeles county, California, and GEORGE A. LYs'rER, a subject of the United Kingdom of Great Britain and Ireland, residing at Los Angeles, Los Angeles county, California, have'invented a new and useful Hot-Air Furnace, of which the following is a specification.

This invention relates to furnaces for hot air, and particularly to a furnace for this purpose in which gas or fluid fuel is used.

One object of the invention is to provide a hot air furnace in which the heated air is takenl downwardly through and from the furnace instead of upwardly, so thatI the furnace is adapted to be used in buildings where there is no cellar or basement, and placed on or partly below theiloor of the story to be heated. y i

` A` further object of the inyention is to provide for drawing the air in an opposite direction to the current of products of combustion, thereby obtaining the greatest elli-.h ciency in heat transmission.

Other. objects of the invention will ap pear hereinafter.

The accompanying drawlngs illustrate an embodiment of the 1nvention,.and referring thereto: Figure 1 is a plan of the furnace with the top removed. Fig. 2 is a vertical section on line rc2-m2. in Fig.l 1. Fig. 3 is a vertical section on line 9ct-wl in Fig. 1.

The furnace comprises an puter shell or casing 1, and an inner shell or casing 2 sup ported within said outer Shell or casing and spaced therefrom to form an intervening passage 3 between said shells, said passage 3 extending completely around the inner shell and from top to bottom thereof, and also extending beneath the inner shell. Said space 3 is closed at the top by a member (i of sheet metal which is formed as a flange' on the. inner shell and extends over and rests on the top of the outer shell, so as to support the inner shell on the outer shell of casing 1, said member 6 having perforations 6. The outer shell is supported by a base 31 adapted to rest on the floor of a room. The inner shell 3 has a closed bottom 3 but is open at the top. The outer shell l is `:of combustion.

covered at the top by a hood 4, supported in any suitable manner, for example, by connection to chimney 16 for the furnace, having its side Walls 4 extending obliquely downward at each side of the outer shell 1, leaving a passage 5 between said outer shell and the hood portion 4 for passage of air, as hereinbefore set forth. The bottom l' of the outer shell l is provided with an outlet opening 19 communicating with outlet pipe 6 leading to a blower or for drawing air downwardly through the air compartments of the heater. The inner shell 2 is provided with a vertical series of tubular compartments or air passages 9, 10, and 11 of rismatic or cylindrical form extending rom one side wall to the opposite side wall. of the inner shell 2, said inner shell walls being cut away to form openings at each end of said passages so that said passages communicate at one end with the space 3 around the inner shelly '2, and at the other end with an air box 8, extending vertically alongside the corresponding end wall of inner-'shell 2, said air box being closed at the bottom and -being open at the top.` There are two air compartments or chambers 7 arranged respectively on the opposite sides of the said vertical series of tubular compartments, said chambers 7 being formed by partition walls comprising inner and outer wall portions ,forming between them an air compartment which is closed at the bottom and open at the top, and said inner and outer walls being bent substantially in conformity to one another, and to the shape of the tubular compartments 9, 10 and 11, so as to extend into the spaces 12', between said tubular compartments. Batlle plates or deliectors 11 are provided on the side walls of the inner shell, extending into the rentrait angles 7' of the outer wall portions of said chambers 7, said outer wall portions being separated from the adjacent side wall of the linner shell to form a passage lo for the products Each passage 13 opens at the lower end into a combustion chamber 14 and,is closed at. the upper end by atop plate 15. 'The inner walls of the two side air compartments 7 are spaced from the tubular members 9., 10 and 1l to form a pasi sage 12l which extends around said tubular compartments and communicates 'at i'tslower end with the combustion chamber 1L and at its upper end with a flue or chimney 16. Pipes 17 lead from the upper ends ot the compartments 7 aforesaid at each side, to the centralpassage 16 aforesaid, leaving a space around each of said pipes through which air ma y pass downwardly into the air compartments 7 said air compartments licing in communication at their lower ends through openings 1S in the end walls of the inner shell 2 with the space 3 around said inner shell. Y

The parts above described may be constructed of any suitable material, sheet iron being preferably used for the said shells, partitions and walls of the several compartments, passages and chambers.

A burner 20 is provided in the lower part of the inner shell 2, beneath the aforesaid compartments or passages extending through said shell, said burner having an inlet pipe 21M extending through a tubular memberV 22 connecting the inner and outer Shells 2 and 1, and forming an air inlet surrounding the burner inlet pipe 21. The said burner inlet pipe 21 is provided with a mixing valve 23 connected to ay gas supply pipe 24. The outlet 19 at the bottom of the outlet chamber l, commuicating with the space 3 ext-ending around the inner chamber, is provided with means for drawing air from the furnace or heater and forcing it to any desired point or points, said means consisting, for example, of a fan or blower 25 mounted on a shaft 26 and located in a easing 27, communicating with said outlet and havingr an outlet pipe 28 connected to the hot air distibuting sys tem to be supplied by the furnace. The fan or blower may be driven by any suitable means, for exampleby power applied to a pulley 30 on the shaft 26 thereof.

The operation is as follows: The burner 2O being started in operation, the hot gases or products of combustion therefrom, ascend through the passages 12, extending around the tubular compartments 8, 9, 10 and 11, and between said tubular compartments and Vthe air compartments cr chamber 7. Some of the heated products of combustion also pass through the side passages 13 between the airl chambers 7 and the side walls of the inner shell so as to heat the outside of said air the air box 8, then through the several tuba-- lar compartments f3, 10 and 11 to the space( 3 at the other end of said tubular compart ments, then down through said space 3 to` the outlet 19 at the bottom. Another pon tion of the air asses Yfrom the top of the heater into the inner shell '2, passing down through the air compartments or chambers 7 and out through the openings 1821ithe bottom thereof, into the space 3 at one end of the inner shell and then down through said space 3 to the outlet. 19. The air is thus divided into several streams, and is brought into contact with large heating surface, both the air and products of combustion being deflected repeatedly and thereby being brought into contact with the metallic heat conducting surfaces. The fact that the air is moved downwardly in the opposite direction to the movement of the heated products of combustion which pass upwardly through the furnace is of advantage in that as the air descends. 'and becomes heated, it is brought into contact with metallic surfaces heated to a higher temperature as it comes cioser to the burner, thereby obtaining greater heat transmittingr eiiiciency for such surfaces and enabling the air to leave the furnace at a temperature more nearly that of the highest temperature of the products of combustion than is the case with natural draft heaters. A further important advantage of this construction of the furnace in which the outlet is at the bottom, is that the furnace or heater can be placed on the floor of the store to be heated or only partly beneath said floor and does not. require to be placed Wholly beneath said floor in a cellar or basement, as is the case where natural upward draft is depended upon. Sufficient air passes through the perforations 6 in top plate 6 to insure circulation of the Yair in the upper part of space 3 and prevent said air from becoming overheated.

What we claim is:

1. In a hot air furnace, an outer casing, an inner shell closed at the bottom and open at the top, and spaced at all sides and at the bottom from the outer casing to form an outer air space, a perforated top member over the space between said casing and inner Shell. an air box open at the top and extending down at one side of said inner shell, said inner shell having tubular compartments extending across said inner shell and communicating at one end with said outer air space and at the other end with said air box, outlet means communicating with the lower end of said outer air space, suction means in Said outlet' means for ldrawing air from said outer air space, a burner in the lower part of said inner shell, an outlet VVflue at the top of thefurnace, and partition walls in said inner Shell for directing the products of combustion against said tubular compart- 1Aiment's, and into said outlet flue.

2i In a hot air furnace, an outer casing,

"fm1- inner shell closed at the bottom and open at the top,- and spaced at all sides andfat the bottom from the outer casing to form an outer air space, an air box open at the top and extending down at one side of said inner shell, said inner shcll having tubular burner in the lower part of said inner shell, and an outlet flue at the top of the furnace.

In testimony whereof, We have hereunto set our hands at Los Angeles, California, 15

compartments extending across said inner this 6th day of November 1912.

shell and communicating at one end With said outer air space and at the other end with said ail` box, outlet means communicating with the lower end of said outer' air space, suction means in said outlet means for drawing air from said outer air space, a

EDWARD C. KENT. LLOYD GILES. GEORGE A. LYSTER. In presence of- ARTHUR P. KNIGHT, MARTHA M. LANGE. 

